3D Skin Layer

The 3D Skin Layer addon will transform your flat Minecraft skins, adding depth and detail to them. Don't ask me how it works — it's magic to me. But it seems like if the skin has multiple layers, the addon makes it so that certain layers stick out, creating a 3D effect. It should work with any skin, although I noticed it works better with some than others. The addon is claimed to work with Actions and Stuff, but in my case, it just made my character completely invisible.

Credits: PandaMine5